ixgbe: Fix - Do not allow Rx FC on 82598 at 1G due to errata
The 82598 has an erratum that receipt of pause frames at 1G could lead to a Tx Hang. To avoid this this patch disables Rx FC while at 1G speed for all 82598 parts. Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -357,12 +357,34 @@ static s32 ixgbe_fc_enable_82598(struct ixgbe_hw *hw, s32 packetbuf_num)
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u32 fctrl_reg;
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u32 rmcs_reg;
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u32 reg;
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u32 link_speed = 0;
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bool link_up;
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#ifdef CONFIG_DCB
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if (hw->fc.requested_mode == ixgbe_fc_pfc)
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goto out;
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#endif /* CONFIG_DCB */
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/*
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* On 82598 having Rx FC on causes resets while doing 1G
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* so if it's on turn it off once we know link_speed. For
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* more details see 82598 Specification update.
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*/
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hw->mac.ops.check_link(hw, &link_speed, &link_up, false);
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if (link_up && link_speed == IXGBE_LINK_SPEED_1GB_FULL) {
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switch (hw->fc.requested_mode) {
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case ixgbe_fc_full:
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hw->fc.requested_mode = ixgbe_fc_tx_pause;
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break;
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case ixgbe_fc_rx_pause:
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hw->fc.requested_mode = ixgbe_fc_none;
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break;
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default:
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/* no change */
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break;
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}
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}
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/* Negotiate the fc mode to use */
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ret_val = ixgbe_fc_autoneg(hw);
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if (ret_val)
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